Understanding solar warranties in Perth: product, performance, and workmanship

A Perth solar system comes with three distinct warranties: a product warranty from the manufacturer (10–25 years, covers manufacturing defects), a performance warranty from the manufacturer (25 years, guarantees minimum output), and a workmanship warranty from your installer (typically 5 years, covers installation quality). They cover different things and are claimed through different channels: understanding each one helps you compare quotes and know what to do if something goes wrong.

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What does the product warranty cover?

The product warranty covers manufacturing defects in the physical panels, inverter, or battery unit. It's provided by the component manufacturer, not the installer.

A panel that physically fails due to a manufacturing defect (delamination, water ingress through the frame, cell cracking not caused by external impact, junction box failure) is covered. The manufacturer replaces or repairs the defective unit.

What it won't cover: performance degradation within the specified tolerance, physical damage from external factors (hail, storm, vandalism), or panels that simply wear out over time.

Typical durations:

• Solar panels: 10–15 years product warranty (some premium brands offer 25 years)
• String inverters: 5–10 years standard (some brands offer extendable terms for an additional fee)
• Microinverters (Enphase): 25 years
• DC optimisers (SolarEdge): 25 years
• Batteries: typically 10 years (Enphase up to 15 years; some brands 5 years)

Claiming a product warranty: You claim directly with the manufacturer or through your installer as an intermediary. The manufacturer assesses the unit, and may require the product returned for inspection or send a technician. A confirmed defect gets repaired or replaced.

Perth-specific: if the manufacturer has no local Australian service agent, claims slow down while goods are assessed overseas. Ask your installer who the Australian service agent is before you sign anything. Under Australian Consumer Law, the selling business bears collection and shipping costs for large or permanently installed goods, so the practical risk is delay, not out-of-pocket return freight.

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How does the performance warranty work, and is it claimable?

The performance warranty (sometimes called the power output warranty or linear performance warranty) guarantees that panels will still produce at least a specified percentage of their rated output after a certain number of years.

How it typically works:

• Year 1: ≥98% of rated output (covers initial slight degradation)
• Years 2–25: ≥84.8% of rated output at year 25 (standard Tier-1 monocrystalline PERC warranty)
• Premium TOPCon panels: ≥88.9% at year 30 (Trina i-TOPCon) or ≥89.6% at year 25 (other TOPCon), and ≥92% (REC Alpha HJT) at year 25

So a 400W panel warranted to 84.8% at year 25 must still produce at least 339.2W after 25 years.

The performance warranty covers the panel's ability to convert sunlight to electricity at rated efficiency, not whether that efficiency will generate your expected dollar savings. Tariffs, self-consumption rates, system design, and electricity prices are outside what any manufacturer can guarantee.

Is it practical to claim? Rarely, for residential systems. To demonstrate underperformance you need:

1. An independently measured power output test (irradiance-corrected at STC conditions)
2. Comparison to the panel's warranted output curve
3. Documentation that the underperformance isn't caused by soiling, shading, or inverter issues

The cost of independent testing often approaches the cost of replacement. Large commercial arrays can absorb that cost. A Perth household usually can't. Treat the performance warranty as a signal of product quality confidence rather than a practically exercisable claim.

Want to compare panel brands by their warranted degradation rate? The best solar panels guide for Perth covers the main options available to Perth households.

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What does the workmanship warranty actually cover?

The workmanship warranty covers the quality of the installation itself: correct mounting, proper electrical connections, work free from defects in labour and materials.

A roof leak from incorrect flashing around mounting brackets, an electrical fault from an improperly crimped DC connector, a panel that works loose because the mounting was inadequate. Those are workmanship claims. Equipment failures fall under the product warranty. Natural degradation and storm or hail damage don't.

Typical duration: 2–10 years, depending on the installer. The New Energy Tech Consumer Code (NETCC), administered by the Clean Energy Council, requires Approved Sellers to provide a minimum 5-year whole-of-system warranty covering both workmanship and product faults on the installation. Some Perth installers offer 10 years.

You claim workmanship directly with the installer who did the job. That's why installer business continuity matters: an installer who's gone out of business when you have a claim leaves you with no practical recourse.

For guidance on checking an installer's credentials and track record, see how to check solar installer credentials in Perth.

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Why does the installer's business continuity matter?

Workmanship warranties are only as good as the installer's ongoing business. Solar has seen many installers enter and exit the market. A 5-year workmanship warranty from an installer who closes after 18 months is worthless.

Consumer Protection WA recommends checking:

• How long the business has been operating (5+ years is a positive indicator)
• Whether they hold a physical WA address (harder to disappear than a van-and-website operation)
• Whether they have a verified ABN
• Whether they have reviews and local reputation

No measure is foolproof. Established businesses also close. Some installer networks have trust arrangements where member companies honour each other's workmanship warranties if a member ceases trading. Ask if this applies to your installer.

For more on what to look for before signing a contract, see how to choose a solar installer in Perth.

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Summary comparison

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What to ask when comparing solar quotes in Perth

1. "Who is the Australian service agent for the panels and inverter?" Confirms warranty claims can be handled locally without overseas delays.
2. "What is the workmanship warranty period, and does it meet the NETCC 5-year whole-of-system minimum?" The New Energy Tech Consumer Code (NETCC) sets a minimum 5-year whole-of-system warranty (workmanship + product) for Approved Sellers.
3. "How long has your company been trading?" Indicator of business continuity for workmanship claims.
4. "What is the panel degradation warranty at year 25?" Compare the guarantee percentage across competing panel brands. Standard Tier-1 PERC = ≥84.8%; premium TOPCon/HJT panels = ≥89–92%.
5. "Is the panel on the CEC Approved Products list?" CEC Approved Products have been assessed against IEC standards for Australian market use and gate STC rebate eligibility.

Reading a quote and unsure what the warranty terms mean in practice? The how to read a solar quote guide and how to compare solar quotes in Perth walk through each line item.

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A complete Perth solar warranty package means: a 25-year panel performance warranty (≥84.8% output at year 25 for standard PERC; ≥89–92% for premium N-type), a product warranty from a manufacturer with an Australian service agent, and a minimum 5-year whole-of-system warranty from an installer with a trading track record in Perth. Ask who you would call for each type of claim before signing.